119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
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/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined( INCLUDED_IUNDO_H )
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#define INCLUDED_IUNDO_H
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/// \file
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/// \brief The undo-system interface. Uses the 'memento' pattern.
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#include <cstddef>
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#include "generic/constant.h"
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#include "generic/callback.h"
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class UndoMemento
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{
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public:
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virtual void release() = 0;
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virtual ~UndoMemento() {
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}
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};
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class Undoable
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{
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public:
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virtual UndoMemento* exportState() const = 0;
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virtual void importState( const UndoMemento* state ) = 0;
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virtual ~Undoable() {
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}
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};
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class UndoObserver
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{
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public:
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virtual void save( Undoable* undoable ) = 0;
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virtual ~UndoObserver() {
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}
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};
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class UndoTracker
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{
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public:
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virtual void clear() = 0;
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virtual void begin() = 0;
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virtual void undo() = 0;
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virtual void redo() = 0;
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virtual ~UndoTracker() {
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}
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};
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class UndoSystem
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{
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public:
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INTEGER_CONSTANT( Version, 1 );
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STRING_CONSTANT( Name, "undo" );
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virtual UndoObserver* observer( Undoable* undoable ) = 0;
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virtual void release( Undoable* undoable ) = 0;
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virtual std::size_t size() const = 0;
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virtual void start() = 0;
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virtual void finish( const char* command ) = 0;
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virtual void undo() = 0;
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virtual void redo() = 0;
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virtual void clear() = 0;
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virtual void trackerAttach( UndoTracker& tracker ) = 0;
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virtual void trackerDetach( UndoTracker& tracker ) = 0;
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virtual ~UndoSystem() {
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}
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};
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#include "modulesystem.h"
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template<typename Type>
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class GlobalModule;
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typedef GlobalModule<UndoSystem> GlobalUndoModule;
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template<typename Type>
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class GlobalModuleRef;
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typedef GlobalModuleRef<UndoSystem> GlobalUndoModuleRef;
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inline UndoSystem& GlobalUndoSystem(){
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return GlobalUndoModule::getTable();
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}
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class UndoableCommand
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{
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const char* m_command;
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public:
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UndoableCommand( const char* command ) : m_command( command ){
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GlobalUndoSystem().start();
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}
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~UndoableCommand(){
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GlobalUndoSystem().finish( m_command );
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}
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};
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#endif
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